The search for sustainable alternatives for waste disposition other than disposal and evaluation of the feasibility of a second life cycle for waste should be a priority in the research and characterisation of alternative materials. In civil engineering infrastructure applications (e.g. railway, pipe bending, or road construction), large volumes of aggregate are required, which necessitates the consumption of natural resources and significantly impacts soils and the environment in the surrounding area. Occasionally, when the in situ soil does not possess the appropriate mechanical properties or has low load bearing capacity for traffic or other loads, chemical stabilising agents are used to improve the soil characteristics. However, the development and implementation of sustainable alternatives must become a priority in economic, social, scientific, and technical strategies to address current environmental challenges. This study analyses the environmental viability of using eco-friendly agents instead of the chemical additives traditionally used in soil stabilisation. Based on the findings, it is affirmed that the bottom ashes from the combustion of an olive and grape waste biomass in cogeneration plants possess adequate properties as an eco-stabiliser, are not harmful to the environment, and are feasible as an eco-agent for expansive soils in civil engineering works.

在研究和表征替代材料时，应优先寻找除废物处置以外的可持续替代方案，并评估废物第二生命周期的可行性。在土木工程的基础设施应用中（例如铁路，弯管或道路建设），需要大量的骨料，这需要消耗自然资源，并严重影响周围地区的土壤和环境。有时，当原位土壤不具有适当的机械性能或交通或其他负载的承载能力较低时，可使用化学稳定剂来改善土壤特性。但是，开发和实施可持续替代方案必须成为经济，社会，解决当前环境挑战的科学和技术策略。这项研究分析了使用生态友好型替代传统上用于土壤稳定的化学添加剂的环境可行性。根据这些发现，可以肯定的是，在热电联产工厂中，橄榄和葡萄废料生物质燃烧产生的灰烬具有足够的生态稳定剂性质，对环境无害，并且可以作为一种生态制剂用于土木工程中的膨胀土。